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For the following independent random samples, use the z-test and the 0.01 level of significance in testing Ho:u1 = u2 versus H1:u1 = u2.
x1 = 33.5 s1 = 6.4 n1 = 31
x2 = 27.6 s2 = 2.7 n2 = 30
2. The manager's assistant, who created a new brochure, randomly selects 400 current customers, then randomly chooses 200 to receive the standard brochure that has been used in the past, with the other 200 receiving the promising new brochure that he has developed. Of those receiving the standard brochure, 35% call for more information about the counseling session, while 42% of those receiving the new brochure call for more information. Using the 0.10 level of significance, is it possible that the superior performance of the new brochure was just due to chance and that the new brochure might really be no better than the old one?
There is a horse race with 12 horses competing. A gambler must rank the 12 horses for first, second, third and fourth place finishing.
Number of rescue calls received by rescue squad in city follows a Poisson distribution with mu = 2.83 per day. Squad can handle at most four calls a day. Determine the probability that squad will be able to handle all calls on a particular day?
If we assume all the possible random samples of 250 students at this university, 95 percent of the samples should have means among what two numbers.
Identify a research issue, opportunity, or problem that uses data that has absolute zero measurements. Some examples include a team member's stock portfolios performance
A particular candidate claims she has the support of at least 60% of the voters in her district. A random sample of 150 voters yields 87 who support her.
Using t test for significance of slope to determine whether the independent variable is a significant predictor of the dependent variable - Find the sum of the least squares slope and intercept parameter?
State the values of the coefficient of correlation and coefficient of determination correct to three decimal places
A baseball player hits 59 home runs during a season with 161 games. What is the empirical probability that the player would hit at least one home run during any given game of the season?
Citing significant strides in math and science by women of all ethnic backgrounds, the College Broad says that the male-female gap on Scholastic Assessment Test scores continue to narrow among high school students.
Test the hypothesis that the proportion of all student cell phone users in the United States who own a smartphone is 35%. Use the 5% level of significance and report your results.
Construct a 99% confidence interval for the difference between the true average boot times of the two types of hard drives. Assume the difference will represent (HDD-SSD) and that the population standard deviations are statistically the same.
The hypothesis is to be tested at the 5% level of significance. The critical value from the table equals:
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